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What is the nature of a mirror having a focal length, of + 10 cm?

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Solution

Convex mirror ( since focal length is positive)

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What is the nature of a mirror having a focal length of, +10 cm ?

Q. Describe the nature of image formed when the object is placed at a distance of 20 cm from a concave mirror of focal length 10 cm.

What kind of mirror can have a focal length of, - 20 cm ?

Solve the following examples

a. An object of height 7 cm is kept at a distance of 25 cm in front of a concave mirror. The focal length of the mirror is 15 cm. At what distance from the mirror should a screen be kept so as to get a clear image? What will be the size and nature of the image?

b. A convex mirror has a focal length of 18 cm. The image of an object kept in front of the mirror is half the height of the object. What is the distance of the object from the mirror?

c. A 10 cm long stick is kept in front of a concave mirror having focal length of 10 cm in such a way that the end of the stick closest to the pole is at a distance of 20 cm. What will be the length of the image?

An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image.

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